<template>
  <div>
    <nav-bar>
      <div slot="left" class="back" @click="backClick">
        <img src="@/assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div
          v-for="(item, index) in titles"
          :key="index"
          class="title-item"
          :class="{active: index === currentIndex}"
          @click="titleClick(index)"
        >{{item}}</div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
  import NavBar from '@/components/common/navbar/NavBar'
  export default {
    name: 'DetailNavBar',
    components: {
      NavBar
    },
    data() {
      return {
        currentIndex: 0,
        titles: ['商品', '参数', '评论', '推荐']
      }
    },
    methods: {
      titleClick(index) {
        this.currentIndex = index;
        this.$emit('title-click', index);
      },
      backClick() {
        this.$router.back()
      }
    }
  }
</script>

<style scoped>
  .title {
    display: flex;
    font-size: 13px;
  }
  .title-item {
    flex-grow: 1;
  }
  .active {
    color: var(--color-high-text);
  }
  .back img{
    vertical-align: middle;
  }
</style>